Cannot back up iphone with itunes because error occured

After updating ios6 i can no longer use wifi.  Imam trying to back up phone so i can restore, but it says an error has occured.  Any suggestions?

Did you check your security software settings?
Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article (http://support.apple.com/kb/TS3125) to resolve this issue.
copied from http://support.apple.com/kb/TS1275 , Update and restore alert messages on iPhone, iPad, and iPod touch

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